Question: RootFinding[Isolate] vs solve

 For solving polynomial systems I used RootFinding[Isolate]. But after discussing the question
I decided to compare Isolate and evalf(solve ([...], [...])). It seemed to me that solve some convenient. The only if in the equation there are integers as a real, they should be recorded with a decimal point. (For real solutions of this procedure should be used with (RealDomain).)  Examples:

I wonder why then the need Root Finding [Isolate]?

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